1. 1. Meir H. Kryger, Thomas Roth, William C. Dement. Principles and practice of sleep medicine.5th Edition.
2. 2. Mary A, Carskadon and William C. Dement. An Overview,Normal Human Sleep.
3. 3. Aserinsky E, Kleitman N. Regularly occurring periods of eye motility and concomitant phenomena,during sleep. Science 1953;118:273–274.
4. 4. Mathew W. O'Malley, Subimal Dutta. REM sleep regulating mechanism in the cholinergic cell compartment of the brainstem.
5. 5. The Stanford University Sleep Research Centre. A brief History.